Added the requested changes to the file group.py

group.py

@@ -1,5 +1,84 @@
-"""An example of how to represent a group of acquaintances in Python."""
+group = {
+    "Jill": {
+        "age": 26,
+        "job": "biologist",
+        "relations": {
+            "Zalika": "friend",
+            "John": "partner"
+        }
+    },
+    "Zalika": {
+        "age": 28,
+        "job": "artist",
+        "relations": {
+            "Jill": "friend"
+        }
+    },
+    "John": {
+        "age": 27,
+        "job": "writer",
+        "relations": {
+            "Jill": "partner"
+        }
+    },
+    "Nash": {
+        "age": 34,
+        "job": "chef",
+        "relations": {
+            "John": "cousin",
+            "Zalika": "landlord"
+        }
+    }
+}
+
+
+#the maximum age of people in the group
+import numpy as np
+
+ages=[]
+
+for person in group:
+    ages.append(group[person]["age"])
+print('maximum age of people in the group is', np.max(ages))
+
+
+
+#the average (mean) number of relations among members of the group
+relation = []
+for person in group:
+    #print(group[person]["relations"])
+    relation.append(len(group[person]["relations"].keys()))
+print('average number of relations among members of the group is', np.mean(relation))
+
+
+#the maximum age of people in the group that have at least one relation
+age_n = []
+for person in group:
+    if len(group[person]["relations"].keys()) >= 1:
+        age_n.append(group[person]["age"])
+print('maximum age of people in the group that have at least one relation is', np.max(age_n))
+
+
+
+#[more advanced] the maximum age of people in the group that have at least one friend
+Ages = []
+for person in group:
+    if "friend" in group[person]["relations"].values():
+        Ages.append(group[person]["age"])
+
+print('The maximum age of people in the group that have at least one friend is', np.max(Ages))
+
+
+
+
+import json
+
+#write file
+with open('group_file.json', 'w') as json_file:
+	json.dumps(group, json_file, indent=4)
+
+#read file
+with open('group_file.json', 'r') as json_file:
+	group_data = json_file.read()
 
-# Your code to go here...
 
-my_group =